Patents by Inventor Evangelos Trifon Laskaris

Evangelos Trifon Laskaris has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Permanent magnet assembly and method of making thereof
    Patent number: 6525634
    Abstract: An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.
    Type: Grant
    Filed: May 31, 2002
    Date of Patent: February 25, 2003
    Assignee: General Electric Company
    Inventors: Evangelos Trifon Laskaris, Michael Anthony Palmo, Kathleen Melanie Amm, Paul Shadforth Thompson
  • Permanent magnet assembly and method of making thereof
    Patent number: 6518867
    Abstract: An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.
    Type: Grant
    Filed: April 3, 2001
    Date of Patent: February 11, 2003
    Assignee: General Electric Company
    Inventors: Evangelos Trifon Laskaris, Michael Anthony Palmo, Kathleen Melanie Amm, Paul Shadforth Thompson
  • Open magnet with recessed field shaping coils
    Patent number: 6504461
    Abstract: A pole piece for use in an open magnet includes a magnetizable body of generally cylindrical shape and made of a ferromagnetic material with a plurality of concentrically-arranged, annular-shaped, radially spaced-apart grooves formed in the inner surface of the pole piece. A plurality of annular-shaped, electrically conductive coils are disposed within the grooves. The pole piece with recessed shielding coils is situated within a cryogenic vessel to maintain the pole pieces at a uniform cryogenic temperature. The result is an open magnet structure which provides a highly uniform, high field, open field of view for MRI with a well-contained stray field.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: January 7, 2003
    Assignee: General Electric Company
    Inventors: Xianrui Huang, Michael Anthony Palmo, Jr., Evangelos Trifon Laskaris, Bruce Campbell Amm
  • High temperature super-conducting rotor coil support with tension rods and bolts and assembly method
    Publication number: 20020190586
    Abstract: A rotor is disclosed for a synchronous machine comprising: a rotor core; a super-conducting coil winding extending around at least a portion of the rotor core, said coil winding having a side section adjacent a side of the rotor core; at least one tension rod extending through a conduit in said rotor core; at least one tension bolt extending between an end of the tension rod and abutting the side section of the coil winding; and a channel housing attached to the tension bolt and the coil winding.
    Type: Application
    Filed: August 15, 2002
    Publication date: December 19, 2002
    Applicant: General Electric Company
    Inventors: Evangelos Trifon Laskaris, James Pellegrino Alexander
  • Permanent magnet assembly and method of making thereof
    Publication number: 20020180573
    Abstract: An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.
    Type: Application
    Filed: May 31, 2002
    Publication date: December 5, 2002
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Evangelos Trifon Laskaris, Michael Anthony Palmo, Kathleen Melanie Amm, Paul Shadforth Thompson
  • Permanent magnet assembly and method of making thereof
    Publication number: 20020175792
    Abstract: An imaging apparatus, such as an MRI system, contains at least one layer of soft magnetic material between the yoke and each permanent magnet. This imaging apparatus may be operated without pole pieces due to the presence of the soft magnetic material. The permanent magnets may be fabricated by magnetizing unmagnetized alloy bodies after the unmagnetized alloy bodies have been attached to the yoke.
    Type: Application
    Filed: April 3, 2001
    Publication date: November 28, 2002
    Inventors: Evangelos Trifon Laskaris, Michael Anthony Palmo, Kathleen Melanie Amm, Paul Shadforth Thompson
  • High temperature super-conducting synchronous rotor having an electromagnetic shield and method for assembly
    Publication number: 20020171320
    Abstract: A rotor is disclosed for a synchronous machine comprising: a rotor core; a super-conducting coil winding extending around at least a portion of the rotor core, the coil winding having a pair of side sections on opposite sides of the rotor core; and a conductive shield around the rotor core and covering the coil winding.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventors: Yu Wang, Robert John Nygard, Evangelos Trifon Laskaris, John Arthur Urbahn
  • Method and apparatus for magnetizing a permanent magnet
    Publication number: 20020171526
    Abstract: A method of making a permanent magnet body is provided. The method includes providing a first precursor body comprising a plurality of blocks and magnetizing the first precursor body to form a first permanent magnet body. A recoil magnetization pulse may be applied to the permanent magnet body after the magnetization. The precursor body may be heated during magnetization. A power supply containing a battery may be used to energize a pulsed magnet used to magnetize the precursor body.
    Type: Application
    Filed: July 3, 2001
    Publication date: November 21, 2002
    Applicant: General Electric Company
    Inventors: Evangelos Trifon Laskaris, Liang Li, Kathleen Melanie Amm, Juliana Chiang Shei, Bulent Aksel, Mark Gilbert Benz, Gerald Burt Kliman, Paul Shadworth Thompson, Israel Samson Jacobs, Harold Jay Patchen
  • High power density super-conducting electric machine
    Publication number: 20020171322
    Abstract: A high power density synchronous machine is disclosed comprising: a stator having conventional stator coils arranged in an annulus around a vacuum cylindrical cavity; a magnetically saturated cylindrical magnetic solid rotor core; a race-track super-conducting coil winding extending around the rotor core, and a coil supportextending through the core and attaching to opposite long sides of the coil winding.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventors: Richard Dawson, Yu Wang, Evangelos Trifon Laskaris
  • High temperature super-conducting coils supported by an iron core rotor
    Publication number: 20020171321
    Abstract: A rotor for a synchronous machine is disclosed comprising: a cylindrical magnetic solid rotor core; a race-track super-conducting coil winding extending around the rotor core; a coil support extending through the core and attaching to opposite long sides of the coil winding, and a pair of end shafts extending axially from said core and attached to the core.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventor: Evangelos Trifon Laskaris
  • High temperature superconducting rotor power leads
    Publication number: 20020171300
    Abstract: The resistive power leads of a high temperature superconducting (HTS) rotor field coil are located in vacuum near the rotor axis and are cooled by thermal conduction to the return flow path by bonding the leads to the tubing bulkhead through ceramic insulators. The lead length, cross-section and electrical resistivity are optimized for minimum heat conduction and ohmic resistance heat transfer to the cold gas. Thermal expansion or contraction of the leads is accommodated by flexible sections at the warm and cold end of the leads.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventors: Evangelos Trifon Laskaris, James Pellegrino Alexander
  • High temperature super-conducting rotor coil support and coil support method
    Publication number: 20020171325
    Abstract: A rotor for a synchronous machine is disclosed comprising: a rotor core; a super-conducting coil winding extending around at least a portion of the rotor core, said coil winding having a coil end section adjacent an end of said rotor core, and a coil support bracing said end section and being thermally isolated from said rotor core.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventors: Yu Wang, Evangelos Trifon Laskaris, Phani K. Nukala
  • Cryogenic cooling system for rotor having a high temperature super-conducting field winding
    Publication number: 20020170298
    Abstract: A cooling fluid system is disclosed for providing cryogenic cooling fluid to a high temperature super-conducting rotor comprising: a cryogen storage tank storing a liquid cryogenic cooling fluid; an inlet transfer line connecting the storage tank to the rotor and forming a passage for liquid cooling fluid to pass from the tank to the rotor, wherein said storage tank is elevated above the rotor and the liquid cooling fluid is gravity fed to the rotor.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventor: Evangelos Trifon Laskaris
  • High temperature super-conducting rotor coil support with split coil housing and assembly method
    Publication number: 20020171318
    Abstract: A rotor is disclosed for a synchronous machine comprising: a rotor core; a super-conducting coil winding extending around at least a portion of the rotor, said coil winding having a side section adjacent a side of the rotor core; at least one tension rod extending through a conduit in said rotor core; and a housing attached to the tension rod and connected to the side section of the coil winding, wherein the housing comprises a pair of side panels.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventors: Yu Wang, Robert John Nygard, Evangelos Trifon Laskaris, James Pellegrino Alexander
  • High temperature super-conducting rotor coil support with tension rods and bolts and assembly method
    Publication number: 20020171303
    Abstract: A rotor is disclosed for a synchronous machine comprising: a rotor core; a super-conducting coil winding extending around at least a portion of the rotor core, said coil winding having a side section adjacent a side of the rotor core; at least one tension rod extending through a conduit in said rotor core; at least one tension bolt extending between an end of the tension rod and abutting the side section of the coil winding; and a channel housing attached to the tension bolt and the coil winding.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventors: Evangelos Trifon Laskaris, James Pellegrino Alexander
  • High temperature superconducting racetrack coil
    Publication number: 20020170166
    Abstract: A racetrack shaped high temperature superconducting (HTS) coil is fabricated by layer winding HTS tape under tension on a precision coil form with a binder such as pre-preg filament-ply interlayer insulation. The coil form includes a racetrack shaped bobbin, two side plates and a series of blocks that define the outside surface of the coil. The outside surface of the winding is over-wrapped with a copper foil bonded to heat exchanger tubing. The coil is baked in the coil form to cure the epoxy then released from the coil form. The resulting coil structure is a strong winding composite built to close tolerance dimensions.
    Type: Application
    Filed: May 15, 2001
    Publication date: November 21, 2002
    Inventors: Evangelos Trifon Laskaris, James Pellegrino Alexander, Richard Andrew Ranze
  • Open magnet with recessed field shaping coils
    Publication number: 20020135450
    Abstract: A pole piece for use in an open magnet includes a magnetizable body of generally cylindrical shape and made of a ferromagnetic material with a plurality of concentrically-arranged, annular-shaped, radially spaced-apart grooves formed in the inner surface of the pole piece. A plurality of annular-shaped, electrically conductive coils are disposed within the grooves. The pole piece with recessed shielding coils is situated within a cryogenic vessel to maintain the pole pieces at a uniform cryogenic temperature. The result is an open magnet structure which provides a highly uniform, high field, open field of view for MRI with a well-contained stray field.
    Type: Application
    Filed: September 10, 2001
    Publication date: September 26, 2002
    Applicant: General Electric Company
    Inventors: Xianrui Huang, Michael Anthony Palmo, Evangelos Trifon Laskaris, Bruce Campbell Amm
  • Cryongenic cooling refrigeration system and method having open-loop short term cooling for a superconducting machine
    Patent number: 6442949
    Abstract: A cooling fluid system is disclosed for providing cryogenic cooling fluid to a high temperature super-conducting machine, wherein said system includes a main cooling system (52, 88) and a second cooling system, said second cooling system comprising a storage device having a first cryogenic fluid; at least one cooling coupling in fluid communication with the first cryogenic fluid from the storage device and a second cryogenic fluid flowing through the main cooling system.
    Type: Grant
    Filed: July 12, 2001
    Date of Patent: September 3, 2002
    Assignee: General Electric Company
    Inventors: Evangelos Trifon Laskaris, Robert Adolph Ackermann, Yu Wang
  • Cryogenic cooling refrigeration system for rotor having a high temperature super-conducting field winding and method
    Patent number: 6438969
    Abstract: A cooling fluid system is disclosed for providing cryogenic cooling fluid to a high temperature super-conducting rotor comprising: a re-circulation compressor; a storage tank having a second cryogenic fluid; an inlet line connecting the re-circulation compressor to the storage tank and to the rotor, and forming a passage for cooling fluid to pass from the re-circulation compressor through the storage tank and to the apparatus.
    Type: Grant
    Filed: July 12, 2001
    Date of Patent: August 27, 2002
    Assignee: General Electric Company
    Inventors: Evangelos Trifon Laskaris, Robert Adolph Ackermann, Yu Wang
  • Cryogenic cooling system with cooldown and normal modes of operation
    Patent number: 6415613
    Abstract: A cryogenic cooling system for use with a superconductive electric machine includes a first set of components arranged in a first circuit and adapted to force flow of a cryogen in the first circuit to and from a superconductive electric machine and being operable in a cooldown mode for cooling the cryogen and thereby the superconductive electric machine to a normal operating temperature, and a second set of components arranged in a second circuit and adapted to force flow of a cryogen in the second circuit to and from the superconductive electric machine and being operable in a normal mode for maintaining the cryogen and thereby the superconductive electric machine at the normal operating temperature.
    Type: Grant
    Filed: March 16, 2001
    Date of Patent: July 9, 2002
    Assignee: General Electric Company
    Inventors: Robert Adolph Ackermann, Evangelos Trifon Laskaris, Yu Wang, Brian Ernest Baxter Gott